Add mbedtls_ssl_ticket_rotate for ticket rotation.

Signed-off-by: Glenn Strauss <gstrauss@gluelogic.com>
diff --git a/ChangeLog.d/mbedtls_ssl_ticket_rotate.txt b/ChangeLog.d/mbedtls_ssl_ticket_rotate.txt
new file mode 100644
index 0000000..b843bfd
--- /dev/null
+++ b/ChangeLog.d/mbedtls_ssl_ticket_rotate.txt
@@ -0,0 +1,2 @@
+Features
+   * Add mbedtls_ssl_ticket_rotate() for external ticket rotation.